Hello, I have a brand new CISCO 3900 router that I need to connect up (2) T1's in a single VWIC. We have a single VWIC with (2) T1 ports. Our ISP installed a new 3MB circuit, but it came with 2 individual T1's. I need to bond both T1's together in a single serial interface card, but I'm not sure of how. Shover is below:

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lrmoore's solution is the correct one here, you always have to configure the T1 controllers in order for the Serial interface to show up. There is no such thing as bonding the 2 T1 into a single Serial interface, you have to use Multilink PPP (MLPPP) to bond them to the Multilink1 interface. However, you cannot use MLPPP to bond the circuits unless:

1) both T1's terminate on the same router on the remote end, and
2) the other end is also configured for MLPPP

In other words, if it wasn't provisioned for bonding, configuring it to do so on your side will have no effect, or cause an outage. Generally, a circuit provider will need to build out an entirely new set of physical circuits in order to convert 2 standalone circuits into multilink-capable.

If your circuits aren't provisioned for multilink, the best you can do is configure load-sharing per-packet, which will round-robin outgoing packets over each circuit, but again this has to be done on both ends for proper effect.

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